build(deps): bump flake8-bugbear from 20.11.1 to 21.3.1

Bumps [flake8-bugbear](https://github.com/PyCQA/flake8-bugbear) from 20.11.1 to 21.3.1.
- [Release notes](https://github.com/PyCQA/flake8-bugbear/releases)
- [Commits](https://github.com/PyCQA/flake8-bugbear/commits)

Signed-off-by: dependabot-preview[bot] <[email protected]>

Author: dependabot-preview[bot]

linter-requirements.txt

@@ -2,5 +2,5 @@ black==20.8b1
 flake8==3.8.4
 flake8-import-order==0.18.1
 mypy==0.782
-flake8-bugbear==20.11.1
+flake8-bugbear==21.3.1
 pep8-naming==0.11.1